Complying with Dam Safety Regulations The Sleepy Hollow Lake Story

Transcription

1 Sleepy Hollow Lake Dam National Inventory of Dams # NY00142 NY State ID# Complying with Dam Safety Regulations The Sleepy Hollow Lake Story Association of Property Owners of Sleepy Hollow Lake Unit Randy Road Athens, NY (518)

2 Association Manager Association of Property Owners of Sleepy Hollow Lake

3 The Community Private Homeowners Association Developed in the 1970 s Governed by the SHL Board of Directors through Protective Covenants and By-Laws Staffing Administrative - 5 Maintenance - 11 Public Safety 24/7-19 Seasonal Lifeguards/ID Checkers 30 Water Treatrment Plant - 3 Waste Water Treatment Plant - 3

4 The Lake Our Reservoir 324 acres 2 ½ miles long 70-feet deep at deepest 17-miles of shoreline Boating, Swimming, Fishing, Waterskiing

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6 Amenities Lodge Beach 2-Pools 2-Tennis Courts Tennis Club 2-Basketball Courts Several Parks Infrastructure 22 Miles of Roads Water Treatment Plant 2-Water Towers Fire Hydrants Wastewater Treatment Plant (Pressurized System) 3-Pump Stations DAM

7 The Dam Completed in 1973 Murderers Creek Class A drinking water reservoir Class A fresh surface waters A source of water supply for drinking Recreation and fishing Class C High Hazard Dam

8 Sleepy Hollow Dam Athens, NY

9 Dam Construction Data Earthen Dam with Clay Soil Core Embankment (Earth) Concrete Spillway Drainage System Regulating Outlet Plunge Pool Downstream Channels Monitoring Instrumentation

10 Spillway Components OGEE WEIR TRAINING WALLS CHUTE APRON - SLAB RETAINING ( WING ) WALLS

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12 Chimney Drain & Base Drains

13 Outlet Works Regulating outlet is a 48 diameter concrete pipe controlled by a mechanically activated sluice gate. Downstream Channel Spillway empties directly into original Murderer s Creek the regulating outlet into an auxillay channel that directs flow to the creek and out to the Hudson River

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15 Monitoring Instrumentation PIEZOMETER WELLS A piezometer is a small diameter observation well used to measure the hydraulic head of groundwater. SHL dam has 15 wells

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17 Critical Dam Data Dam Length: 753 Feet Dam depth: 150 at top to 350 ft at bottom Year Complete: 1973 River: Murderers Creek Reservoir: 3.9 Billion Gallons of Water Raw Water Intakes: 5-feet and 15-feet deep Filtration Plant Capacity: 2 Million Gallons per day Watershed: 13.3 Square Miles Dam Elevation: 82.5 Feet Spillway Elevation: 70 feet Spillway Type: Ogee Spillway dimensions: 80 x 550

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20 Dam Safety Revisions EAP Due August Submitted June 2008 Inspection and Maintenance Plan Due August 2010 Completed January 2010 Engineering Assessment Due August 2012 and every 10-years after Annual Certification by January 31 each year beginning 2010

21 Sleepy Hollow Lake Dam Emergency Action Plan The Plan Inundation Map Notification Flow Chart Engineering Assessment Inspection and Maintenance Plan Action Items Table-Top Physical Drill Promulgation and Concurrence Continuing Education Networking

22 EMERGENCY ACTION PLAN NATIONAL INVENTORY OF DAMS #NY00142 SLEEPY HOLLOW LAKE DAM Association of Property Owners of Sleepy Hollow Lake, Inc Unit Randy Road Athens, NY (518) Sleepy Hollow Lake Copyright 1999

23 TABLE OF CONTENTS I. NOTIFICATION FLOWCHART 1 II. STATEMENT OF PURPOSE.. 5 III. PROJECT DESCRIPTION. 6 IV. EMERGENCY DETECTION, EVALUATION, & CLASSIFICATION. 8 V. GENERAL RESPONSIBILITIES UNDER THE EAP 11 A. DAM OWNER RESPONSIBILITIES. 11 B. RESPONSIBILITY FOR NOTIFICATION. 13 C. RESPONSIBILITY FOR EVACUATION.. 14 D. RESPONSIBILITY FOR DECLARATION OF WATER EMERGENCY 14 E. RESPONSIBILITY FOR TERMINATION AND FOLLOW-UP 14 F. PROVISIONS FOR SECURITY MEASURES 15 G. EAP COORDINATOR RESPONSIBILITY 15 VI. PREPAREDNESS 16 VII. INUNDATION MAPS 18 APPENDICES A. Figures 1. Regional Vicinity Map 2. Dam Location Map B. Procedures By Classification C. Plans for Training, Exercising, Updating and Posting the EAP D. Site-Specific Concerns E. Guidance Documents for the Dam Operator 1. Dam Incident Report Form 2. Visual Inspection Checklist & Diagram

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26 Table Top November 2009 Working with Local and State EMS AAR NYSEMO REGION II The tabletop exercise was valuable and well-organized to bring all the agencies together for numerous reasons. The time for all the necessary personnel to meet is before an actual incident occurs in order to develop a relationship based on trust and respect. There are many examples of disasters being managed more proficiently if the significant staff had worked together previously. Also, this exercise revealed what supplies, equipment and personnel are available during a disaster from different agencies.

27 Physical Drill Greene County Emergency Services and New York State Office of Emergency Management DamEx10 Sleepy Hollow Lake Dam Alert and Notification Drill 25 September 2010 AFTER ACTION REPORT/IMPROVEMENT PLAN

28 Participating Organizations Athens Fire Department Catskill Fire Department Coxsackie Fire Department Greene County Emergency Services Greene County Sheriff American Red Cross Sleepy Hollow Association West Athens Lime Street Fire

29 Promulgation and Concurrence A Form must be submitted for all EAP s to indicate that consultation with local emergency managers has been completed. The owner is required to be fully familiar with the entire EAP, as the owner is responsible for the implementation of the EAP in the event of an emergency. An EAP is useful only if it accurately reflects site conditions, is kept up to date, and the roles of the various participants are understood and agreed to. It is the responsibility of each dam owner to develop an EAP tailored to their dam, and to coordinate the EAP with County Emergency Managers, other emergency responders, and local officials. The dam owner should seek to work with county and local emergency managers to develop a planning team that is aware of the dam, conditions at the dam site, and the unique conditions that must be considered should a dam incident occur.

30 Engineering Assessment Hydraulics and Hydrology Spillway Capacity The dam must handle a design flow rate of ½ the probable maximum flood = must handle drainage runoff imposed by a hurricane event Old standard HMR-33analysis New standard HMR 51/52 Stability Analysis Spillway and Ogee Weir Slope Stability Analysis of Earthen Dam

31 Inspection & Maintenance Plan Quarterly Inspection by staff Piezometer Readings Overgrowth of Vegetation Animal Burrows Annual Staff meetings Regular inspections by P.E. Dan Proper, Proper and O Leary Engineering Monitoring Points

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34 Continuing Education Opportunities NYS DEC FEMA National Dam Safety Program Technical Seminar in Emmitsburg, MD every February ASDSO Association of State Dam Safety Officials Annual Conference Regional Conferences Publications

35 Networking Sharing of information Village of Athens Confirming Engineering advice NRCS Learn from others Experiences NYS Chapter of Dams??

36 Thank You! Laurel Mann (518)